USDS
USDS is an upgraded version of the DAI token. Upgrading is optional. It is an ERC-20 token with permit functionality and EIP-1271 signature validation. The USDS token also enables two-way conversions between DAI and USDS tokens, using the mint and burn functions of both tokens. The conversion rate of the stablecoin is 1 DAI to 1 USDS.